Combined automatic burglar and fire alarm system and telephone service.



` o. AsMussEN. COMBINED AUTOMATIC BURGLAR AND FIRE ALARM SYSTEM ANDTELEPHONE SERVICE.

APPLxATlQN FILED Nv.7. 1914 5 SHEETS-SHEET I.I

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Y ZZO cd'rzzb J'en/ By 1 d vArrow/vim 0. ASMUSSEN. COMBINED AUTOMATICBURGLAR AND FIRE ALARM SYSTEM AND TELEPHONE SERVICE. APPLICATION FILEDNOV. 7. 1914. 1,150,239. Patented Aug.' 17, 1915 5 SHEETS-SHEET 3 0.ASMUSSEN. COMBINED AUTOMATIC BURGLAR A ND FIRE ALARM SYSTEM ANDTELEPHONE SERVICE.

APPLICATION FILED NOV. 7. I9I4. I 1,150,239. I Patented Aug. 17,1915.

5 SHEETS-fSHEET 4.

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G. ASMUSSEN.

kGOIYTBHHE'D' AUTOMATIC BURGLAR AND FTRE ALARM SYSTEM AND TELEPHNESERVICE.

APPLICATION FILED Nov. 1, I9I4.

1,150,239 Panmug. 17,1915.

5 SHEETS-SHEET 5. DI

PATENT orrrcn.

-OTTO ASMUSSEN, OF BROOKLYN, NEW YORK.

COMBINED AUTOMATIC BURGLAR Specification of Letters atent.

AND FIRE .ALARM SYSTEM AND TELEPHONE SERVICE.

Patented aug. 17, 1915.

applicati@ ined November 7,1914. serial No. 870,751,

T all whom it may concern v B .e it known that I, Or'ro AsMUssEN, a

. Subject of the King of Denmark, and a resiaov dent of Brooklyn, in thecounty of Kings and State of New York, have invented a new and usefulCombined Automatic Burglar and Fire Alarm System and Telephone Service,of which the following is a specification. l

rIhis invention is a system employing a central station or watch housewhich iselectrically connected with aplurality of subscribers stations,there being devices located at the subscribers stations, and indieatingapparatus at the central station whereby a` burglar alarm or lire alarmmay be automatically sentin to the central station from any one or moreof the subscribers stations.

One of the objects of the invention is to provide a single circuit overwhich both the burglar and lire alarm signals may be sent from thesubscribers station to the central station.

Y A further object of the invention is to provide a system whereby,should several subscribers stations attempt to signal the centralstation at the same time, the signals from the various subscribersstations will Abe successively received at` the central station, and.this is accomplished, generally,

'by providing means at the subscribers station for repeating thesignal'indefinitely until the particular subscribers station is releasedfromthe central station, whereupon ther next subscribers station 1norder has its signal impressed at the central station and scribersstation.

A further object of the invention is to provide means whereby thelinesand cony nections through the subscribers stations may be tested fromthe central station in order to locate faults in the system, and in thisconnection, the invention includes means whereby any subscribers stationmay be disconnected from the system without-interference with theoperation of the remaining stations so that should the apparatus of a.subscribers station become damaged, as when the house burns down, etc.,that station can be immediately cut out of the system.

Again it is the object of the invention to provide for telephoniecommunication`between the subscribers. stations andthe central stationor between two subscribers stations, using the same line wires forthe'tele-v phone 'circuit as for the burglar' and lirel vide a systemfor thepurposes described in which the operating circuits are of thenormally closed type, whereby :any interruption of the' current will besignalized at4 the central station. f

- Another object of the invention is to make provision for the breakingof the main line circuits tov the central olice 'through the automatic.switches of the subscribers sta'- tions in the event that the signalwheels of those stations should stop with the contact` brushes on any ofthe contact plates.'

In its generic nature the invention provides a centralstation in whichis located a polarized relay, an audible signal and two distinct visualsignals, one'v for theiire alarm indication and one for the burglaralarm inthe polarizedy relay; a resetting device is also provided andamain line circuit (either metallic l'or ground return) connectsthecentral station with the subscribers stations,

Vof which latter lthere may be any desired number connected in the linecircuit, and each subscribers station includes a single repeatingimpulsator or telegraphing device by means of which 'the stationspredetermined identification signalis telegraphed by successiverepetitions until received and noted at the central station, and by thecen tral station operator the subscribers station is released orresetgtwo distinct sets of Vswitching devices, one onthe burglar alarmdication, the signals lbeing.contrlled by for resetting the switchingdevice and inand one' for thefre alarm, are'v located at each'subscribers station and coperative connections` are Iprovidedv betweenthe VVswitchingdevices and the impulsator and include a "source ofelectrical energy for vsetting tlie impulsator into action to `send outthe impulses of the desired polarity into the main line circuit toactuate the polarized relay at the central station and thereby set the,proper Signal. Means are also provided i under control of the centralstation operator turn stopping the action of the signaling device. Theapparatus of each station also includes two main switch relays, a set ofautomatic switches, a set of bridgingrelays, main line openingrelays,andl a telephone set, the whole being so cordinated that bylrmeans rof energizing currents emanating and controlled from the centralstation, the

. telephone sets of any two stations'may be brought into connectionwithone another, Aintermediate stations may be locked out, ortheaiixiliary apparatus may be set for purposes of line testing by thecentral station operator. The auxiliary apparatus alsoin-` cludes mainline batteries that are adapted to be brought into operation at times tocooperate with the interchanging apparatus so lthat when it is desiredto cut oveiistations yfronti one section into another section, the

same may be accomplished by the central `station operator.

The interchanging station apparatus includes two sets of switch relaysand a set of bridging rela-ys, the switch relays being operated one bycurrents flowing from one side offthe station', and the other bycurrents flowing from the other side of the station, the bridging relayscoperating with ,the switch relays to effect the necessary bridging overof the line connections ofI one connection to the connections vof anadjacent sect1on,.when desired. The interchanging stationapparatus alsoincludes two normal line energizing batteries, one of which furnishesthe normal energizing current that' flows over one section, and theother fur-y nishes the current that tlows over another section of thelinstallation. The apparatusl at the interchanging station also includes-suitable local batteries for taking care of thev local circuits.

- 'The apparatus of the interchanging sta- 'tion is'operated andcontrolled'from the central station by lcurrents emanating over the linewires of either section #l or section :fi-t2,A and lentering .the'interchanging' station either from one side or Vthe other, as` the caseparts, all of which will be A signals 457-458.

of the ire and burglar alarm sets of a subscribers station apparatus,with the parts in the normal position. Fig. 4 is an enlargeddiagrammatic view of the auxiliary appa` ratus at the subscribersstation with the parts in the normal position. Fig'. 5 is an enlargeddiagrammatic view of the interclianging station with-the parts in thenormal position. Fig. 6 is a view similar to Fig. lV showingdiagrammatically the relationship between the stations of section #l and#2 when one of the stations has been cut out on section #1. Y

in the accompanying drawings, like numerals and letters ofreferenceindicate like or corresponding parts in all ofthe figures,andFigs. 2 to 5 inclusive, areso arranged that by laying the sheets endto end, the apparatus may be shown in their relative connections.

The `appara/.tus at lle central station-At the'central station there isprovided a polarized relay, two distinct visual signals and an audiblesignal, one of the visual signals y 457 coperating with the burglaralarm mechanism at the subscribers station, while the other 458,coperates with the lire alarm mechanism, at the subscribers station. Theaudible signal 464 is operated wheneither av rire or burglar alarm issignaled. The polarized relay 450includes the coils 446 which have twodistinct windings and the relay is provided with the usual pole pieces447 that coperate with the balanced armature 449.

The armature 449 is provided with lever contacts 453-452 that are inelectrical connection with one pole of the local battery 462, the otherpole of which`is connected by the connection 461 with each of the visualThe signals 457-458 are respectively wired up at 459-460 -to fixedcontacts 455-456 that coperate with opposed ones o the levers 453-452 toclose the 'local circuits through the visualv signals, as

willl later more clearly appear." The central stationpolarized relay isalso provided with fixed contacts 454 that are electrically.con

, nected by wires 465 with'the audible signal 464, such signal alsobeing connected by battery 462.. It will be noted that theaudiblec'signal is thus adapted to be operated whichever Way' thearmature 449,01: the re,

'I lay 450 is moved over.

Coperati-vevwith the\ie and burglar alarm mechanism there is providedinthe central station, a hand switch 467 that is ioo y wires 466-461with the negative pole of the `4"4 the former contact incassa connectedin the local circuit of the balancingY battery 470. The balancingbatter/47 0 is connected to the local Winding of the relay magnets 446by a Wire 471 and is also connected by Wire 469 to the contact 468 ofsivch 467. The switch 467 is also connected by a. Wire 472 to the localWinding of the magnet 446. Thus, there isprovideda normally closedbalancing circuit through the relay magnets Which counter-balancesuthenormal main line current as ivill be later more clearly understood. Oneterminal of the main line'winding of the coil y445 is connected to theline Wire connection 312, While the. other terminal `is connected to theline Wire connection 209 that connects With the contact 544 of anotherline opening switch '542 vvhichis also connected to the line vvireconnection 208. 451 is a balancing spring which maintains the balance ofthe lever 449 when the magnet 446 is denergized. The central stationapparatus. is also provided with ya telephone Set oi. the usualconstruction, the hook lever 473 of which normally rests in engagementwith contacts 494l and 494 being grounded through a connection and alsoconnected by a Wire 493 to the receiver 491. The receiver is alsoconnected by a. connection 492 to the lever 473. The contact 474connects by a wire 475 -yvith the signal bell 476, that is in turnconnected by a Wire 477'uith the ringer 47 8, rlhe ringer is connectedWire 479 to the-lever of the line switch 480 and by a branch 485130` aVcontact '490. The line-opening switch just referred to includes theContact 481 that is connected by a connection 482 to the"'line Wireconnection 312.

and it also includes a contact 483 that is connected by a Wire 484 tothe line Wire connection 208.

1n addition to the foregoing, the central station apparatus, includestwo testing signaljs 503-504, which should preferably be of differenttypes so that the signa-ls may not be confused andI for convenience 'lcall one a buzzer and the other a bell signal. `There is also provided adouble throw switch 500 which has levers 497-498 and iiXed contacts501-496--499-502 to co operate with the respective levers. The contacts501 and 496 are connected to the buzzer 503 by connections 507-505,respectivclyavvhile the contacts 499-502 are electrically connected withthe bell 504 by connections 513 and 506 respectively. The lever 497 ofthe switch 500 is connected by a connection 525 with the line Wireconnection 312, While the lever 498 is grounded through a connection.541. r1`here are also'provided five batteries or sources of energizationat the central station. These. batteries are numbered respectively 510,520, 530, 542 and 540 and theircircuits are respectively line Wire- 200and ground, line wires 20G-300,

' wire 522 to the connection by a.

A apparatus ct' its negative pole connected by a Wire 521 to the Wire50.7 and its by a connectionv 519 of a key 514 positive pole connectedto the l'ixed contact 515 Which is in turn connected by a 501. Thebattery 530 has its negative pole connected by wire 528 to the groundconnection 541 and its positive pole is connected by a connection 52T tothe contact 526 of al key 524 and also by a Wire 518 to the lever of aswitch 516. The key 524 is connected by a connection with the Wire 525that joins to the line Wire connection 312, While the contact 517 ofswitch 515 is connected to the Wire 525. The kev 524 is for shortcircuit closing action. While the switch 516 is adapted to maintain a.closed circuit for an indenite interval of time.- The battery 542 hasits negative pole connected by a connection 534 with the Wire 525 Whileits positive pole is connected by a connection 532 with the contact 531of a key that is grounded by the connections 529-528-541- rEhe battery540 has its negativepole connected by a connection 539 to the line Wireconnection 208 and its positive pole connected by 'a connection 538 tothe contact 537 'of lrey 535, which is Vin turn connected at to the Wire525 that runs to line Wire connection 312.

The y foregoing constitutes a description of one section of the centralstation apparatus, it being understood that this mechanism is duplicatedfor each section of installation.

Z/cscpt'ion of the burgar and fire alarm the Subscribers stations.-Thgere is provided :at-cach subscribers sta- "on two sets of apparatuswhich, for convenicnce of description, I shall describe as the lire andburglar alarm apparatus and the auxiliary apparatus.

Referring particularly to Fig. 3, it Will be noticed that the fire. andburglar alarm apparatus includes two circuit controlling switches, 3.151.4- and 51. B.- and 'two main line circuit opening relays M. L. S. C.and M. L. S. D. ln addition to the switches and relays there is provideda single tele# graph impulsing motor mechanism 209, tWo distinct sets ofcircuit closers, Ione set 32`33 for the re alarm mechanism, and theother set 34-35 for the burglar alarm mechanism. A main line currentimpulsing battery 46-47 is provided for each side of the apparatus andthere are also provided suitable local signals 50-51 and local batteries198-199- Each switch -S. A.- and 5. B.- includes a polarized armature 13having an arc switching segment provided with alternating contactmembers and msulating portions 26 to cooperate with the relatively fixedcontacts 15-16, 17-l8, 19-20, 21e-22, 23-24. Each switch is alsoprovided with operating magnets 14 that contain two windings, a localwinding and a main line winding. The contact 15 of each switch -S. A.-'-and S. B.- is connected to one terminal of the local winding of theoperating magnets 14. Each of the contacts 17 of the switches isconnected by a wire 186 to a wire 197 that leads to the motor 209. Thecontacts 23 ot the respective switches are connected by wires 178 and18,1 respec tively with the ,local signals 61 and 50. The contacts 16and 18 of switch #-S. A.-- are connected together to a wire 189which-leads to the battery 198. The contact 24 of switch -S.'Af-.connects by a wire 177 with the wire 189 and with the wire 173, thewire 173 connecting the negative pole of the battery i 40 with thecontact 39 of main line switch C.

The contact 21 of switch A connects by a `wire 215 with the contactmembers 214, on

the signaling disk 212, the main line open ing relay 28 having its coilconnected in the circuit of the wire 215. The contact 22 of switch A isconnected by a wire 192 with the main line Awire connection 307, 'andalso by a connection 95 to one terminal of the main line winding of theoperating magnets v14, the other terminal of which connects by aconnection 112 with the armature '138 of the quick-acting relay 28. Thecontact 143 of this relay connects by a' wire 113 to contact 19 ofswitch -S. A.- The contacts 20 of the switches A and B` connect by aconnection 165 with the contact4 38 of the' respective main lineswitches C and D.

Each' ot the switches A and B is provided with ay contact 27, thecontact 27 being connected by a connection 183 with the' coil 36 of therespective main line switches C and D, the other terminal of its coilsbeing connected together by a wire 184 which is also electricallyconnected with the local battery 199. The positive pole of the battery199 'is connected by wires 79 with the respective armatures 13 of theswitches A and B. 4

The burglar alarm contact members 35 are connected together by aconnection 169 which connects with the wire 172 that joins the positivepole ofthe battery 46 with the iixed contact brush 218 that coperateswith the signaling disk 212. The contacts 34 of the burglar alarmcircuit closers are joined together and connected by a. wire 175 with vone terminal of the v local winding of the coils 14 of switch A. One setY33 of the fire alarm circuit closer contacts is connected together by awire 171 which joins to-one terminal of the local winding of the magnets14 of switch B, while theotherA contacts 32 connect by a wire 170 withthe wire 187 that joins the positive pole of the battery 47 to the brush220 that coperates with the signaling disk 211.

If desired, a polarized magnet 29 may be provided to coperate with oneof the magnets 14 of switch A and in that event the armature 29 isconnected by a wire 227 to the positive pole of battery 198 and by aconnection 228 to the wire 169. A fixed con,- tact 30 may coperate withthe armature 29 and connect by a wire 180 to the wire 175 for a purposelater understood. The conwinding of the magnets 14 of switch B, the

other terminal of which is connected by a -wire 232 to the contact 19 ofthat switch. The contact 24 of switch B is connected by a .wire 182 tothe wire 188 that connects the contact 39- of main line switch D with`the negative pole of the battery 47. The contact 16 oii switch B isconnected by' a wire.

191 to the wirel 182 and the contact 18 of that switch is connected bya` wire 190 to the wire 189 that joins with the negative pole of thebattery 198. y

Each mainline switch C includes the operating magnet 36 and the armature37, and the three active contacts-38, 39 and 40. The contact 40 of themain line Switch 5.C is connected to the main line' wire connection 205,while the contact 40 of switch D is connected to the main lineconnection 308. The armature 37 of zmain line switch C connects to the,line Wire connection 204, while thearmature 37 of mainlineswitch Dconnects to] main line .wire connection 307. The main line wireconnection 204 connects with th terminal changing switch ofthe auxiliarypparatus (hereinafter referred to), bythe wire 42, the connection beingmade via post 5, while the Wire 41 from that terminal changingswitchconnectsto the post 6 to which the line wire 200v joins. The'lineWire connection 307 joins with, the said terminal connection changingswitch by a wire 83 via post 11whi1e,

line current signaling impulses being sent out into the main line by thebatteries 46-47, as the case maybe. The signal 51 is connected by aconnection 179 of the con providedwith an auxiliary apparatus for linetesting and telephonie purposes, which apparatus also is provided withmeans for cooperation with the controlling .instruinentalities at thecentral'station for changing over the main line connections otx thesubscribers station when it is necessary to cut a station from onesection of installation into another section of installation. Illheauxiliary apparatus of each subscribers station includes a set ofbridging relays B. R. E., two sets of switch relays, one, S. R. li.,controlled from the central station by currents passing into theauxiliary apparatus from the right of Fig. 4 and the other, S. R. l.,being controlled by currents passing Ainto the auxiliary apparatus fromthe lett in Fig. 4. 1n addition to the switch relays and the bridgingrelays, there is provided a main line terminal switch F, and a secondswitch G .which is provided for the -purpose ot' cutting in theauxiliary normal `main line batteries 95-96, under certain conditions,as will later more clearly be eX- plained. The auxiliary apparatus alsoincludes two local circuit batteries '97-98 and a telephone set T.

By reference to Fig. 4, the wiring of the auxiliary apparatus will beunderstood.

1-237-8 and 9 designate terminal posts, which have been indicatedforcenvenience. The main line wires 200-300 from the left oFig..4connect to the posts 1 and '7 respectively. The post #1 is connected bya wire 48 to two contacts 1 on the switch F (the reference characters 1to 12 inclusive on nthe switch lF are the same as the numbering of therespective terminal posts, for convenience in following the connectionsbetween the same). Obviously, the terminal posts may be omitted and thewiring run direct to the switch but they are indicated simply for"convenience of illustration. The post 2 connects byv wire 49 with a setof contacts 2 of the switch F; post El connects by wire 44 to contacts 3of the switchrF; post 4 connects by wire 43 to contacts 4 of switch F;post 5 connects by wiref42 to contacts 5 of switch F; post 6 connects bywire 41 with contacts fi of switch F post 7 connects by wire 52 withcontacts 7 ot' switch F; post 8 connects by wire 53 with contacts 8 ofswitch F; post 9 connects by wire with contacts 9 of switch F; post10-connects by wire 55 with contacts 10 of switch F; post llconnects bywire 83 with contacts 11 of switch F and post 12 connects by wire 84with contacts 12 of switch F. It is understood that posts 4 5-6 and 10-11-12 are the posts of the burglar and tire alarm sections and areindicated .in Fig. 3. The switch F has a polarized armature which isfulcrumed at 71 and is provided with operating magnets 88-89, each ofwhich serves as a relay to coperate with the respective armatures 90-92that control the lcircuit connections between the contacts 91 93 and 94respectiyely. The armature 70 of the switch F is provided with an arcsegment having alternately disposed contacting andinsulating segments,as clearly shown in Fig. 4 of the drawings. The switch G is similar inconstruction to the switch F. It also has a polarized armature 54 and anarc member which .is provided with alternately disposed insulatedsections 56 and contacting sections 57 to cooperate with the severalsets ot' fixed vcontacts 58- 59, 60--61,'etc. The magnets (S6-67 of theswitch G are double wound-magnets and one of them, 66, acts also as arelay magnet to coperate with the polarized armature 80 that normallyrests on the. fixed contact 81.

'The contact 59 of switch G is connected by wire 280 with the auxiliarymain line battery. 95, such battery being also connected by wire 281 tothe contact 63. 'The contact 59 is also electrically connected to thewire 20.2 .which runs to the contact 115 ofthe bridging group R. E). Thecontact 58 which opposes the contact 59-is electrically connected to thecontact 60,. and by a wire 203 the contacts 58-60 are connected to theterminal post 2.- IThe contact 61 is connected by a wire 283 to thebattery 96, which also is connected by a wire 282to the line wireconnection 304. The contacts 77 and 7 G are electrically connectedtogether and by a wire 278 that connects with the wire 255.

The contact 68 which opposes'the contact 77 1 to the polarized armature80. The contact 69 which opposes the Contact 76 is connected by a wire285 with the upper or lirst winding of the magnets 66-67, such windingbe' ing also connected by the wire 230 to the contact 72. The contacts73-75 are connected togetherand by a wire 277 lthey are electrically'connect-ed with the cbntact 94 of the switch F. The contact 74 whichopposes the contact 7 5 is connected by a wire '78 to the contact 81 ofythe switch G. The contacts (S2-464 are connected together to the linewire connection 303. The Contact 65 is while the contact 93 of switch Fis connected bythe wire 247 with the armature'108 of the l 128 (group S.R. I.)

connected to the v'line wire'connection 304. Y

The bridgingrelays include the main local holding magnets lO1-102, thewindings of which are cnnectedtogether by a connection 293. The coil ofrelay 101 is connected 'is connected by a wire 294. with the coil ofrelay 130 of, switch-relay S. R'. H. The

bridging relay group alsoincludes the three' armatures 103104105 and thelocal holding relays 99-1OO that coperate withv the armatures 105-103respectively. Themagnets of the relays 99-1100 serve as holding magnetsto coperate with the armatures 108-106 respectively to break thecircuits through the same at the contacts 109-4107, as will later bemore clearly understood.

111-118 are holding magnets for the armatures '105-103 respectively.These magnetsoperate by mainline and ground return currents vandddo notoperate local c1rcuits, and the-#bridging relay. group R. E. alsoincludes a double Wound resetting magnet which is operated by main linecurrents as will The main line wire vconnection 202 runs to,

Y the contact 115 ofarmature 105 while the contact 114.*of thatcoperates with that armature is 'connected to the winding of magnet 111,and also `to theY mainline con-I nection 245 which runs to the armature138 of switch relay group S.,R..H." The winding of magnet 111 is al'so'connected by va wire 246 with armature# 92 of switch F,

bridging relay group. Contact 109 is con# nected by a wire 248 withthemain line circuit opening magnet 144 of the switch relay S. R. H y tact117 are connected v"by" wire 260 with the armature 1410i switch relaygroup S. RQI. The winding of magnetV 118l is also connected by Wire 259'with'the armature 90 of switch 5F the contact 91 of'which switch beingconnected by wire 258 with an arma-- y p n y v. A

A 296, While the armature `136 of group S. RJ..

is electrically connected by-'a connection 318; 11,5, u

ture 106 of the bridging relay'group. The

' contact 107that coperates with' armature with the coil 144 of therelay of group "S. R. I.

One winding of the relay Mois-connected by wire 274 with the core ofholding relay and it is also connected main limewire connec- 106 isconnected vby wire 254 by wire 273 with the tion '203. The' other 110 isconnected by wire 1 tion while thecontact 226 -is connected by. a"wire244 tb later be explained.` 135 of ,group S. R.. H.-

The coil jof relay 118 `and thecon the coil 99 of the winding. of-.therelay'v 275. with the. armature 105 and by wire 276 it isvconnected toIthe contact 139,. group Y S. R. H. Each switch relaypS. R. H.and S. R.I. includes-a main operating magnet 119 and two polarized armatures 120and 121 respectively, these armatures' `coperating' with the pole. iecesy1 18".:1 19jand with holdingrelays 12 128 and resting relays 129.yvvThe' group R. H. vdill'ersfromV the group S. R. l; vin that the'former is pro- 1 vided with av resting relay -'while the latter isprovided simply/'with a stop v334 in lieu of the resting relay." Thecoils '-119 of I I. S. R.' H. are

contact 133 is rconnected by a wire256`jfwith the Winding of the'magnets 8 8-.89ivhich Y winding is also connected by ajwire Y55,-to1'the wire 253. The-contactg1134 connectsby.Iy

l9ov

a wire 263 lto the Contact ,149.'y The contact l connects by a wire 266to the contact 148 which is in turn. connected by a wire264 to the llineWirex'onnection 301. (The contact 135 of' switch relay groupf'S. R. I.connects bya wire 257 to .the wire 256). Th

provided with insulated contacts 123 that are connected togetherzbyWires 269, such wires 269 being electrically connected by'` a wire270tothe telephone Contact .166. Each armature 121 is also providedwithan insulated section- 122, the insulated. sections of the twoarmatures 121 beingconnected together by'a wire 297 that isfin,vv turnconnected by a wire 296 to the positive pole of vthe local battery 98,`the negativepole of which is connected by a connect1on5320jwithbridgingv relay' 'group BLR. E., such coil 99. being also connected by aconnection 319 group S. R. H. ,l The 'armature 136 of group S. R. H. iselectricallyk connected to thefwire with the coil of bridging relaymagnet 100, such magnet being in turn connectedby \a with the contact137 of' nection between 1 contacts 132^-134 `andv 133-135 respectively,while the armature' 136 controls connection with the contact137.

The'linewire connection 244 between tile-l contact' 226 of thev bridgingrelay grou B. R. E. and the contact 139 of the switch) relay group S; R.H. coperates with the armature 138 of the` local resting relay 130 oneterminal of the winding of which is connected to the coil 102, byconnection 294 as before described, while the other terminal .isconnected by a connection 295 to the'core A S. R. H. is electricallyconnected by a Wire 333 to the contact 331 of group S. E. l. by a localcircuit connection, the armature 120 of group S. R. l. being connectedby a local circuit wire 289 to the Wire 28S which runs to the positive pole of the local battery 97.

The armature 121 of the switch relay groupsv are electrically connectedby connections 288-290 to the positive pole of the battery 97. Thearmature 120 ofthe switch relays S. ll. H. and S. R. I. is provided witha contact 121 that Vis adapted, 'at times, to engage the fixed contact125, such contact 125 being electrically connected by -a connection 262to the contact 150 in the main line circuit. Each contact 221 of theswitch relay groups S. R. H. and S. lil. l. is connected by a connection222 to the contact 22?). rllhe connection between the cont-acts and 118is adapted to be made by the insulated portions 221 of the armatures 115when such armatures are drawn -over into Contact with the contact 147.The resting relay 129 of group S. l. l. has one terminal 298 connectedto the core, and the other terminal 311 connected to the contact 137which is in turn connected by a Wire 316 to the negative pole of thelocal battery 9S. The corresponding terminal ofi' the coil 129, group S.ll. H. is also connected to the Wire 316 by a connection 299. The coil128 group S. R. I. has one terminal connected to the core, as at 323 andthe other terminal connected by a connection 824 to the Wire 321 whichruns from the coil of relay-127, group S. lt. l. to the armature 104Coit the bridging relay B. R. T5.' The coil of relay-127, group S. R. H.also connects to the'arniature 10i by virtue of the connection 325, withthe Wire The coil of each of the respective relays 127-129-130-128 isconnected electrically with the respective cores ot sucirelays tocoperate electrically with the armatures 121 and 120.

The normal main line circuit which passesv from the interchangingstations battery enters the auxiliary apparatus and at post #1, flowsvia connections 1S-#t9 to post #2 and from thence through connections203-202, 213 to armature 225 and from thence to contact 226 and thenceover Wire 244 to contact 139. From contact 139 the current flows toarmature 138 and from thence via Wire 245 'to contact 112i, acrossarmature 105 via main line connection 261 post #3 wires sisii3 to post#t and from thence through the burglar and fire alarm section of theapparatus as before described. Returning, the current enters theauxiliary apparatus from post #10 over Wires 5Fl-45, to post #9, and

-from Wire 301 to armature 146 (group S. B. 'HJ across to contact 150,over Wire from the other side.

802 to key 152 and across to contact 156.v

From contact 156 the current loivs over Wire connections 303-301 tocontact 155 of key 151, across key 151 to connection 305 and from thenceto contact 150 (group 70 S. B. 1.), across armature 146 and line Wireconnection 30610 post #S and from thence over Wires 53-52 to post ,irl-7and out into the main line 300. The keys 151-152 have vcontacts 153-151respectively lwhich are 75 connected by a connection 329 and also havecontacts 157-158 respectively which are connected by a connection 271,this connection being also connected by a wire 272 to the telephonecontact 166. The contact 155 30 of key 151 is connected to the contact1118 (group S. R.. 1.,). h

The telephone set is of the usual type and includes the lever159, thereceiver 160, the magnet 167 and the ringer 168. The 85 lever 159normally engages a grounded contact 161 which is grounded through aconnection 252 Vto which the telegraph instrument is electricallyconnected and to which the Contact stud 161 is connected by a cone0vnection 251. The contact 162 connects by a connection 251. The contact162 connects by a connection 330 with the ringer 168 and magneto 16'?,the latter being connected to the wire .2?0. The wires 253-2419 connectthrough 250, the circuit between the studs 161-165 being held closed bycontact 168 pressed up by the telephone lever. ltshould be understoodthat the. contacts 224 of armature 1&5 are insulated from the. rest ofthe 100 armature soas not to be in electrical connection with the same,as such contacts areI simply bridging contacts,`as it were, Vfor thei'ixed contacts 118 and 223 respectively.

The apparatus et the ntcffcmtgng 1sm.- 105 :fictif-The interchangingstation contains an apparatus which has two substantially dis'- tinetgroups of mechanism, one being operated by current imuulses enteringlthe station from one side, while the other is oper- 110 ated by currentimpulses entering the station The interchanging' stationanparatusincludes two switch relays S. lt. l. and S. R. L. and a gro-upof bridge ing relays B. R. J. that coperate With the respective switchrelays. vln vaddition to these there is provided two main line normalcurrent producing batteries 'that serve as line terminal sources ofenergy for the main line circuits that enter the station from/each sideunder normal conditions. There is also provided local circuitscoperating with the switches and bridging relays 'for' assisting in theoperation of the saine. The group of bridging relays B. R1. J. includesa. double wound resetting relay 358 operated by main linel circuitcurrents, two other relays 336-337 also operated by main line currentstivo local 'operating relays 338-339 and two local holding relaysBaO-311. Cooperating with relays 340-338-336 is an armature 342. Asecond armature 344 coperates With the corresponding relays 337-339-341,the

armature 344 .and the. relays 337339-341 coperating directly vwith theswitch relay K, while the armature 342 and the relays 336-3384340coperate directly with the other switch relay L, the relay 358coperating with both switch relays K and L, as 'does valso the, armature343, the arma-ture 343 also coperating With the -relays 35S-.338. Therelay 336 is provided With a second armature 347 that is connected byV aconnection 424 with the main line connection 207 that also connects tothe armature 342. The Contact 351 of relay 336 is joined by a connection421 to a wire 422 that connects the contact 354 of relay 340 to thecontact 357 of relay 341. The relay 337 is'also provided with a secondarmature 348 that connects by'a connection 419 to the wire 420 whichjoins the contact 356 of relay 341 with the contact 355 of relay 340,the relays 340-341 having tWo dead stops and two live contacts,A asindicated, and each relay 340-341 is provided with an armature 345-346,respectively, and the contactl 353 of vrelay 337 is joined by a Wire 423to the armature 344 to which armature thel main line Wire connection 206is joined,4 The armature 343 is coperative with a local circuit contact352 that joins by a Wire 435 to A the Wire which connects the negativepole of the local battery 425 with the coil 338, the coils 338-339 beingconnected together by a connection 433. While the coil 339 is connectedby a connection 432 to the coil of local relay 365 of switch S. R. K.

One terminal of the windingI of relay 336 is connected by af Wire 416With one Winding of the coil or relav 367 of switch S. R. L.,

. while the other terminal of the Winding of the coil of relay 336 isjoined to a contact 349 that coperates ,with the armature l342 and iselectrically connected at 415 With-the contact 381 of switch S. R. L.The coil of relay 337 has one end connected by a connection 413 to 011ecoil of the relay 367 of sWitch'S. R.' K., While the other terminal ofthe coil or relay 337 is joined to the contact 350 that coperates Withthe armature 344 and is also connected by a connection 414 to thecontact 381 of switch S. R. K.

Armature 343 is electrically connected to a Wire 442 of the localcircuit, While the contact 352 thatcoperates with the armature -343 isconnected .to the Wire 435, as before stated. Each switch relay K and Lincludes al main operating relay magnet 359 having poles 362-363 andprovided With polarized armatures 360-361 Each switch group alsoincludes a holding relay 364 for the armature 360, a holding relay 366for the ar' mature 361 and resting relays 365. The switch relay K isalso provided With a restdouble Wound main line relays 367 and theresetting relays 242. The relay 368 has an armature 387 and contacts388-389 While the holding relay 364 of each relay Kand L has an'armature 369 and four contacts 37 0-37 1-372 and 373. Each resting relay365 has an armature 375 and a contact 376, While each holding relay 366is provided with an armature 377 and four contacts 378, 380, 379, 381.The holding relays 366 are double Wound, they each having a localcircuit Winding and a main line circuit Winding. Relays 368-364-365 arepurely local circuit-relays. The one'terminal of the coil 359 of eachswitch relay K and L is connected by aWire 401 to the contact 379, theother terminal. ofthe coil 359 being connected by the Wire 394 to thecontact 371. Contacts 374 are provided to coperate with the armature361V and they are lconnected by Wires 393 to the contacts 373. The coreof connected by a Wire 403 to the other coil of the magnet 358 whichother coil is also connected by a Wire 405 to the main line Wireconnection 311. The contacts 372 are connected by Wires 395 to thecontacts 384 and the contact 370 of S. R. K. is connected by aconnection 417 to the armature 387, which is in turn connected by a,connection 412 to the main line Wire connection 309. rIhe contact 378 ofeach switch relay K and L is connected by a connection 400 to thecontact 385 While the contact 380 is connected by a connection 397 toone Winding of theV coil of relay 367, the connection. 397 alsoconnecting with the Wire 410 that leads to the contact 240 of the relayV242. One terminal of the main line coil of holding relay- 366 isconnected by a connection 399 to the ground, While the other terminal ofthis coil is connected to one of the windings of coil 367. This Windingof the coil 367 in S. R.,K. is connected by a Wire 413 with the coil ofthe relay 337, while the corresponding coil of S. R. L. isconnected by.a Wire 416 -to the coil of Arelay 336. j

391 is the main line normal energizing :batteryfor the circuit Whoseline terminal 1,150,239 f Y i 9.

. the corresponding main line battery for sendnects to the armature 343.The coil of relay ing out the normal main line vcurrent to the 365 ofeach switch is connected to its c'ore line circuit' whose terminalsenter the interand the coil of relay 365 (S. R. K.) is conchangingstation from the left in Fig. 5. nected by a wire 432 to the coil 339,such This battery, like the battery 39h-has its coil 339 being in turnconnected by a con-v '.10'

negative pole connected to a main line con- 'nection 433 with coil 338which connects, by

nection (310) and its positive pole connecta connection 434, with thebattery 425. The

ed by the wire 406 with one of the coils of local winding of each relay366 has one terthe relays-367 being the coil that'connects minalconnected with the core of the relay by the Wire 397 to the contact 380of that and the other terminal connected by a con- 75 switch. Each ofthe armatures 382-383 of nection 445 and 443'respectively to the contherespective switches 367 are connected tonection 442.. with the armature343... The

gether, by a connection 396, to the respecmain line wireconnection 311joins with tive contacts 381 and the contacts are con# the terminal post170 at the left of Fig. 5,V

nected by wires 414-415 respectively to the While the connection 309joins with the ter- 80 contact 350--349 respectively of the bridge minalpost 170 at the right of Fig. 5. Simirelay group J. The contacts 372 ofthev larly the line wire connections 206-207 c0nswitch relay 364 connectto the respective neet to-the terminal posts 169,

, contacts 384 by connections 395, while the' 071, operation of thebrglar alarm mech.

contacts 385 connect by the connections 400 @nimm- Assume now that oneof the bur- 85 to the contacts .378, as before stated. glar alarmcontacts 34 is moved to close the The armature 387 coperates With'tWOcircuit with contact 35 of a particular stacontacts 388-389, the formerConnecting tion. The instant this Occurs, the local batwith a wire 411to a coil 242, the said @Oil tery, 198, will send out a currentoverWires f being grounded by a connection 409, as be- 227- and 228 tocircuit closer contact 35. 9C fore stated, while the contact 389connects to FromV contact 35 the current iiows across the main line wireconnection 310. The armacontact 34 and travels over wire 175 throughture 239 of switch S. R. K. connects by a. G011- the local winding ofcoils 14 (S. A.) to connection 241 to the wire 412, while the armfltact15, over armature contact -25 to contact.

30 ture 239 O R. L. CODlleCtS by a; (201111665 16A and return t0 batteryover Wire 189, 95 tion 241 to the line wire connection 310.-Thsfestablishes a @i1-Cuit Whih will ener- The COil OI'ElELy 242 0fCOXlIlGCtS gize the Coils 14: and rock over the arma. With a, Wire 237t0 the Wire 236 that ]0iIlS ture 13 0f Switch t0 rest on Stop contheJDWO COllatS @Wl-238 that COPGIaG tact 27.' At the instant the circuitis closed ,35 with the armature 360 oi (S. R. L.)- Tlle through thecontacts 34 and 35, and the mag- 100 other terminal of the coil 242isgrounded met coils 14 energized, the lever 29 is atthrough aconnection409. tracted to engage the contact 30 and shunt 425 is the local cllcultbattery, the P051- a portion ofthe local current over wire 227, tivepole of which is connected by a C011- through wire-180 to wire 175 andthereby 40 IleCtlOIl the armature R. maintain the local). CircuitCurrent 105 by fl Connection 426.427 t0 the ama'blll@ the magnet coils14 untilthe circuit is 361 (S. R. L.), and by a cOnneCtOn 426 broken bythe armature 13 rocking over into With the Contact 390 (S.' R. L.). Thebf- Engagement with the, Stop 27 tg bring an tei-ies 391-392 alsofunctwn at tuiles HS insulated portion between the contacts 15 lOC-lbattel'es- The main 1.111@ battery 92 and 16. This takes care of thecondition no is electrically connected, locally, by a Wlrf which wouldexist were .the circuit imme- 441 With the @Oil 0f relay 340, the SaldColl diateiy broken at the Contacts 34 and 35, S0 being llSO COIiIleCdby 2t Wll 439 With the as t() insure a, Suiient gnergizing 0f thearmature 375 (S. R. L), the @Ont-act' 376 magnet coils 14 to throw thearma-ture over,

that COPGIBGS With SllCh armature heilig even though the Circuit bemomentarily 115 connected by a wire 437 to the positive pole Closed atthe Contacts 3431161 35; 'If the of the battery 392. YThe battery 391has its local- Circut from the battey 198 via connegative poleconnected, locally, by Wire 440 tats 341-35, 01- va relay Contaets 22B-30, is with the coil of relay 341, Such Coil being not suiicient tothrow over the armature 13 also connected by a wire 438 with the armatoits working place, the main line battery 12 ture 375 (S. R. K.) thecontact 376 that co- 46 is brought into operation to make a shortoperates with such armature being connectlocal circuit before being usedfor signaling ed by a. connection 436 With the positive purposes z'. e.before the path from the batpole of battery 391. The coil of each of thetery 46 is opened up to the central station.

-50 relays 364 is connected to its core, as is also The momentarycircuit afforded by the 125 the Winding of relay 368, such winding ofmain line battery, only comes into action in relay 368 being connectedby a connectionr the event that the local circuit has not com- 429 tothe negative pole of battery 425. The pleted the throwing over orrocking over of coil of relay 364 (S. R. K.) is connected by thearmature 13 to its Working position. If

'65A a connection 443 to the vzfire 442 that con-A the armature remainsin its normal. position, 13e

a circuit will be established .from the main line battery 46 via wires172-169, across contacts 34-35 (whichare still closed. andacross-contacts 29 and 30viawire`228, if the previous currents have beensuiiicient to draw up armature) through the localA winding of coils 14,viacontacts'l and* 16 ture 13 over if it has not line battery 'Ycircuit'may line vbattery employed for this and wire '189 to wire 177andv from thenceover wirel73. backA to battery 46. This last currentwill be sufncient to throw the armaf risen), andthe use of the nain .'46'for establishing this'local or may not be taken advantage It isllllustrated to show that the main may,l while otherwise idle, bepurpose. No'w assume Y that `the armature13 of switch (S. has

' been thrown over battery 13,' stop on to contact 27. lThisv opens anew'path for the local, circuit from- 198 at the same time the firstlocal circuit, above described, is broken by an insulated 'portion'v 264of the arch member coming inbetween thecontactsl and 16. 'I object tostart Thenew clrcuit now opened up has for its -the motor 209 intoaction. This circuit emanates from the local .battery 198 and' passesviawire 196 to motor 209 and fromthence over wires 197-186, contacts 17and 18 =1(which are now in circuit), wire 189 back to battery198f Thislcurrent starts the motor into operation'to turn the signaling'di'sks211 and 212 and remains in operation as long tween contacts 1 and I18.

PThen the armature 13 of switch '(S. A.) was rocked over to rest oncontact 27, a circuit was closed between it and the stop contact 27-thereby permltting a current to flow from the battery 199 via wire 7 9,armature main hne switch C, andv rom thence back to battery via closeduntil the apparatus is reset. The coil 36of the relay"(M. L S. C.)having ome thusenergized, draws over the armature` 37 to engage thecontacts 38-39.' The local circuitthrough the motor 209 starts itintooperation, as before described, thereby turning the signaling disksv'or wheels 211 andl 212 to successively bring the various con# tacts217-216 and 213 and 214, into enga ment with the fixed contacts 220 and218, respectively. Every time oneof themoving'A f contacts comes intoengagement Iwith the fixed contact, a circuit is closed at thosecontacts. When the`contacts 214 engage'the contact 218,l the circuit ofthe battery 46 .lsj closed and current Hows from battery 46 via' wire172, contact 218, contact 214, 21 5,f' through coil 28 of thequick-acting -c1rcu1t opening relay,

via wire 215, contacts 21- 25-22, wire 192 to line wire 307 and from'thence 'through the line w1rev connections 835-84 to line wire 300,over'line wire 300 may or may (and draw up the amature 29 through wire312, to wi're kline lwinding of. relay -coils 446, Wire 209 and switch543.. The instant the line wire.

. tion between as thecircuit closed bea 27, wire 183,'to magnet 36'ofthe wire 184. This circuitis kept.

y throwing current,

vquick-acting relayT4 28 the iowgrlilt will' be'suspended 's o as topermit. the`4 .current sent outivia main return '.viawirey200,`fro1uimam hne batteryA tothe central station, the current retvopfer wire 200, enters thevstation over line" A wlre connections 4142,204- and flows tol armature 37 from thence across to contact 39 andreturn to'battery 46 over wirev173.

When the quick-acting relay 28 is provided, no lcurrentwill iow fromwire 192 through coils 14 pulse of! the signaling wheel. The "relay notbe used, as desired.. It is understood that the current flows from thesignaling station through any intermediate stations that are set innormal position,vt'oA the central station;

through the central station apparatus connection wasbroken atthesignaling sta-v the armaturel 37 and the contact 4 0, the normalenerglzing current in, broken, with the the mam line circuit was resultthat armature 449 .at the tion was drawn over to one side circuit to the4bell central statoclose the operator has been battery 470 at thecentral station, may be 'nullifed -The im ulsed current from thesignaling station te egraphs the burglar telegraphic signalpf thatstation by currentimpulsed througlrfthe vmain line winding magnets446,'thusaccordingly closing the circuit to battery 462 to ringl thebell 464 and light up the lamp 457., It. will be observed' that theaction -212 isalternately to signal the central sta-.

main line impulses.

.Operation burglar valarm signale- The bur contacts 34'-35..of,someprotecte "premises, '(say`st'ation #2) vhaving-'closed and a 46 ofthat-station, as before described, a cir @uit haben closed at.therese/@Meur during the signaling im-` The current passes 464, byreason of the ener-f zation o'f the coils 446 by the current from attery470. yAsj'soon as the central station.l thus warned, he openstheswitch467 so that'the influence of theV Were the quick-act.

hng currentwoul divide where the-r wire of ceihtmlxtatonfcpparatuaon ilarp'alarmv wire. 300.11m!

208 via themain l ses' ieo

lessby using the.'

, v 12o" potential ofthe kbsvzttery 46- to act on the' Y the -Switch'Aafter it has once been thrown,

It should be understood right here that the contact wheels 211-212 ofeach station have their contacts 213-214 diii'erently arranged at eachstation, so as to have each station give a diiierent telegraphic signalin any desired code. The current entering the central station, as beforedescribed, passes over thepline wire connection 312 and through theoperating or main line winding of the polarized relay 450, passingthrough coils 9446, as before described. The lever 449 of the polarizedrelay is normally balanced by the springs 451 and the balancing battery.

470. Then the burglar alarm signal of tele graphic impulses comes in andthe main line current passes through the coils 446, the lever isattracted at, say the right hand coil. This causes the lever 453 toclose against the circuit contacts thereby permitting the local battery462 to send out a current via wire 463, lever 453, contact 454, wire 465.to audible signal 464 and return via wires 466 and 4615 The localbattery 462 also sends out a current via Contact 455 and wire 459 to thevisual signal 457 and return via wire 461. Thus each impulse that isreceived in the central station causes a corresponding operation of theaudible and visual'signals at that station. This opera tion continues tooccur, indefinitely, until the watchman at the central station hasnoticed the signal and reset the instruments, as will be hereinafterdescribed.

I desire'it understood that while I have indicated the visual signals asincandescent bulbs, and the audible signals as bells and buzzers,nevertheless any standard type. of signal that may be desired can beemployed in lieu thereof.

Resettz'ng of the burglar alarm signaling apparatus al the subscribers.emiliana-Jn order to reset the apparatus which has been sending in theburglar alarm signal, l have provided, at the central station, a battery520'and key 514. Upon depressing the key 514, a circuit is closed Jfromthe battery 520, which causes current to flow via wire 519,

` contact 515, key 514, wires 522 and 501 to line wire connection 208(switch 543 is now opened) out over line wire connection 208 into linewire 200 and return via line wire 300 into the central station, overWire 525 to lever 497 of switch 500, contact 501, wire 507 and return tobattery over wire 521. This current will flow whenever an insulatedportion of the disk 212 is in engagement with the contact 218. lVhenthis occurs,.the current enters the subscribers station over line wireconnections 41, 42, 204 and flows to lever 37 of the relay switch C.

From the lever 37 the resetting current flows to contact 38 over wire165, across contacts 20-25-19, through Wire 113 to contact 143, acrosslever 13S (magnet 28 being denergized when the insulated portion of thedisk vim..

central station. The resetting current tlow-k `ing through magnet 14 ofswitch A is in a direction opposite to the setting current and thereforereverses the polarity to restore the armature 13 to its normal positionand thereby break the various circuit connections at such switch. Thebreaking of these circuit connections cuts out the motor battery 198from action and allows the signaling motor 209 to come to rest. Thishaving been accomplished and no other currents coming into the centralstation, the central station operator now resets the normal line battery391 at the interchanging station, as will be hereinafter understood(after closing switch 543) and then again closes switch 467 toreestablish the balancing current in the signaling relay 450 at thecentral station. i

Operation of the fire alarm mechanism.- The operation of Vthelire alarmmechanism is essentially the same as that of the burglar alarm mechanismsave only that the tire alarm side of the apparatus comes into actioninstead of the burglar alarm side, and in view of the foregoingdescription of the burglar alarm mechanism, it is thought that theoperation ot the fire alarm mechanism will be clearly understood byreference to the drawings, and a detailed description thereof is thoughtto be unnecessary. Sup# posing station #l is sending in over a burglaroriire alarm signal to the central station, and station #10 should beginto send tire or burglar alarm telegraphic impulses, the impulses ofstation #10 would not be received at the central station, owing to theopening of the main line circuit at station 1, Contact 40, switch C andthe signal of station #10 would not be received until the centralstation operator has reset station #l and as soon as station #l has beenreset to close th'e main line circuit at contact 40, switch C, thecurrent from station #10 will immediately come into the central station.

Operation of the central stallo/a apparatus on fire alarm signal-Sincethe operation ofV the central station apparatus is substantially" andthe contacts 454-45'6 are engaged 1n' lieu ot the contacts 454-455, adetailed description of the operation of the central station apparatuson tire alarm signal is thought to be unnecessary. f

Resettz'ng of the ire alarm apparatusfln order to reset cit-her thelire" or burglar alarm apparatus it will be noticed that the currentsent .out from the central station must iow in the 'same direction inthe line wires as the signaling current. Therefore, in order to resetthe fire. alarm apparatus the signaling current flows from the centralstation over wire 300 and return, over wirey 200 (the reverse of theburglar alarm cur.

rent). It is necessary to close the circuit at y the central stationfrom battery 540. This is done by depressing the ley 535, (after openingswitch 543) which causes current to flowfrom the battery 540 via wire538,

contact 537, key 535, wire -,536.1wire 525,

line wire- 30.0 and return. to central station thence it passes via wire165, contacts 20, .25, 19, wire 232, resetting winding of coils overwire 200, line wire connection 208 and wire 4539 to battery 540. '--Thecurrent entersv the subscribers station over line wire connections84 83,307 andflows to' armature 37 (switch l)) and {iows to contact 38-fron1 f14-s'witch B, wire 195, armature 231, contact 132, wirel -V194, throughwire 193 to line wire connection 204, over line wire connections .42-41to line wire 200 and return to central stationr. This current,being in adirection reverse to the current that threw over armature- 13 of vswitchB, will reverse -the polarity andvrestore the armature 13 to its normalposo A burglar or re alarm mechanisms are opersition and consequentlyreset the apparatus; It will be observed that when .either the ated, themain line circuit to all stations beyond the particular stationoperating is broken at the switches C or D, as the case may be, and thuswhen that station signal-A ing, which is nearest the central station,has

its signal impulsedto the signal station; the` remaining stations signalbeing received at the central station successively as the precedingstations signal has been noted and such preceding station has beenreset.

Operation. of the auxiliary apparatus forf the purpose of Zinctestz'ng.-Should a break .in the lines occur or any interruption-of thenormal constant current that flows through the lines, the'balancingbattery 470 will functionto throw over the armature'of the relay toclose the circuit to the signal 450,

thus. indicating towthe centralpstation opera'- tion closes the circuitat switch 50,8 and leaves it there until'the endl of the testingoperation for each station and also opens' l .switch 543. The closing ofthis switch 508 results in the 'setting .up of a'current from battery510 which Hows over w1re 512, switch '508,4 wire 501, into main line'lconnection 208 yof the central station into line wire 2.00 and'.l overthat4 line wire into the iirstv statlon Aapparatu-s (station A). Forconvenience, we

will rst follow the current as it Hows ythrough the auxiliaryapparatusof station ture 92, and contacts 93 and from thence over wire 247,armature 108 of relay 99 across same to centact'f109 and va wire 248through the winding of relay 144 (S. R.-l-I.) owing from thence overwires 249 and 250 l to telephone stud 165, across. thespring contactplate 163 to stud 164 and from thence via wires 251 and 252 to ground,returning 'via the ground connection 5415-513 te` the negative pole ofbattery 510 at the ceiftralf station. At the instant that the lever 146of relay 144 is drawn over against post 149, by the. energizing of thecoil of relay 144, a path is opened for the next current to opcrate.

This next current emanates from l battery 520 which is on the metalliccircuit (i. e. using both line wires 200. and 300).

contactpost* 142, and from thence "over wire 261 to the coil 119 ofswitch (S. R.-H.-) through that coil over wire 267, to contact 132 ofrelay 127, across the' armature 131--to contact- 134, over wire 263, tocontact 149 of relay 144, across itsyarlnature 146 to line wireconnection 301 and via wires 45-554-3084-307f83-84 back over line wire300 to the central. station, in over. wire 312 to branch 525 acrossswitch contacts 497, 501, over wire 521, back to battery520, thus.completing the circuit.. When the currentl from the battery 520 wasthrough the main coil 119 of switch S. R.- H.-) the magnet bar 1-,20 ofthat switch was` thrown over by the action of this current into contactwith pole pieces oli relay 128 vthat holds the bar in its shiftedposition bythe local current that is switched fromv the windingfof relay130 intol the winding of relay 128, such local current flowingover wires322-321 to lever 104 .(which hasbeen released by the denergizin of themagnet 101 due-to the'brealrng o the circuit beassing tween the lever120`and the core contact of relay 130 when 120 left that place), andfrom thence to contact 116 with which the' lever -is engaged uponvdeenergizing of the magnet 101, and over wire 292, back to battery 97.-The breaking of the circuit: be-

tween the lever 120 of switch (S.^R.-H.) and the contact of vthe'corecf'relay 130, not" konly broke the circuit for magnet-10.1l but1talsolvbroke Ithe circuitof magnet'f102.. The

denergization of magnets 101 andv 102 would allow the levers 103 and 105to move over and break the circuit with contacts 117 and 114respectively. The lever 105 is, however, prevented from dropping over tobreak the circuit at contact 114 by reason of the energization of thecoil of relay 111 by the constant current from battery 510 of thecentral station that flows over line wire 200 with ground return. Thiscompletes a half setting of the auxiliary apparatus and preares it forthe testing processes orthe com- P plete setting for telephoniecommunication etween two parties, as'will be later explained.

The apparatus having been half set as above described,ithe testingprocess is conl ducted as follows: The switch 500 at the and the earthconnections are so far in order.A

The current from battery 520 upon closing of the key 514 has, however,at the subscribers station, taken another path skipping the big coil 119of switch (S. R.-H.-) to return with greater force. This other path isfrom contact 114, over wire 245, to relay lever 141, which has beendrawn over into contact with -contact 221 by the energization of relay128 when armature 120 was moved into engagement with the core contactunder the influence of the action of the coil 119 as hereinbeforedescribed. The current ows from lever 141 to contact 221 and from thenceover wire 222 to contact 223, andacross the -insulated Contact 224 oflever 145 (the latter being held over by the energized coil of relay144) and-from the contact 224 of lever 145 over contact 148 andconnection 264 to wire 301 and return via connections 300, back tocentral station in on wire 312, along wire 525, to lever 497, over leverto contact 496, through sounder 503 and'from there over wires 507 and521 to return to battery 520. The,l current from neither of thebatteries 520 or 510 can -flow to any stations beyond the rst' one beingtested for the reason that so long as the current from the battery 510is iiowing through sustaini ing relay 111 of the station beingtested'the lever 225 of that relay is drawn over to open Vthe circuitYat contact 226, so thatthe circuit that would otherwgelieformed fromcontact 114 via wire '245, armature 138, conltact 139, wire 244, contact226, armature lever 225, and wire 243 to line connection 202, will bebroken at the relay 111.

The foregoing describes the way in which the line connections between astation and the central station can be tested, as well as the groundconnections.

To -sct he sta-tion for telephonie communcatz'on.-For telephonecommunication it is necessary to set the other magnet bar 121. This isdone by using a current from the battery 530 at the central station vialine 300 and ground return. The current from batterv 530, upondepression of key 524 flows over the key into line wire connection 525and out over line wire 300 to the station that has been halt1 set, asbefore described, for testing purposes. The return circuit at thecentral station is from the ground over wires 541, 523 to battery 530.The current from battery 530 that flows over wire 300 enters theparticular station over Wires 84-83-3074308-55-45-301 and passes to thelever 146 of relay 144 (which is still energized by the current frombattery 510 as hereinbefore described), across that lever to contact 149and from that contact, by wire 263, the current passes to contact 134then over lever 131 to contact 132. From contact 132 the current flowsover connection 267, through coil 119 of switch (S. R.-H.) and fromthence over wire 261 to contact 147, over lever 145, wires 249 and 250,to telephone studs 165, 164, and from thence to ground and return tocentral station. The energizing of the winding 119 of switch (S. R. H.)by this latter current from battery 530 results in the magnet bar orlever 121, being drawn over to disengage the core contact of restingrelay 129 and engage the core of holding relay 127 and at the same timeclose the vcircuit at contact 126. The

relay, 127 is immediately energized byvav local current to keep themagnet lever 121 over in that position. The local circuit thusestablished is from battery 97 to lever 121, through 326 and coil ofrelay 127, wires 325,

324, 321, lever 104, Contact 116 and wires i 292 and 291 back to battery97. At the moment that the bar 121 was drawn over into contact with thecore contact of relay 127, and that relay became energized, by the localcurrent mentioned, the circuit throu h the coil of resting relay 129 istherey broken, whereupon the lever 136 is thrown back into engagementwith the contact 137 and this closes a local circuit of which thebattery 98 is the energizing source. Tn this local circuit the currentliows over wire 296 via armature lever 136, contact 137 over wire n319,through' the coil of holding relay mag# net 99 and from thencethecurrent returns to battery 98 viawire 320. Relay 99 is now energizedby the current from local battery 98 which energizing current owsconstantly until the apparatus is reset, thereby sustaining the lever105` inv the position shown 1n station (Fig. 4) namely, its normalposition. The main line current from battery 5101s lnow cut oi at thecentral station switch 508,

and telephonic communication can be eiected between the central stationoperator and the station whose apparatus has been set as described orbetween say two stations that have been set 4in the manner abovedescribed. It will be noticed that there is nowa through "line throughthe set station from the line wire connection 201 to the \line wireconnecti'on 202., The passage is `from connection 201 to lever 105,thence to Contact' post 114, through wires 245 to armature lever 138 tocontact 140 and from thence over wires 332 and 269 (S. R.-H.) contact123 ;l from contact 123 to contact 126 and from thence over vwire 268 toline wire connection 202. i

The reason why a gap is provided between the line wire connections 301-302 at contact 150, is that the battery 530 and key 524 (circuit line300 and ground return) are not used alone for the .setting of the magnetbar 120 of switch (S. R. -H.) but such battery is also used for throwingthe constant current battery 391 at the interchangl ing station intocircuit; therefore in order to.

be able to use the battery 530 for both purposes, it is necessary tobreak the circuit between linewire connection 301 and 302 through themedium of the relay armature 146 and contact 150 so that under normalconditions the circuitwill be closed and will be opened at the momentthe current from battery 510 is brought into play to energize the relay144. Supposing now that a station v (say station ,1) has been setfortelephonie The parts will be -1n thel communication.

position indicated in Fig. 4, excepting that tion the armature 121'ofmagnet 127 and armature lever 131 of switch (S. R. H.) are howeverthrown over to theopposite position the, magnet 129 will be denergizedand its armature'136 will be resting against the stop 137. Suppose thatthe rst station (station #1) wants to speak -to another station (sta-#30) in that event all of the intermel diate stations (stations #2 to#29 inclusive) will have to be locked out of connection,

als

and this is done in the same way hereinbefore described -for the firstpart of the action of setting the station for testing purposes, viz: Theswitch 508 is closed and the current from battery 510 is kept iiowingconstantly (via line 200 and ground return) and this act is followedimmediately by the current from battery 520 upon depression of lthe key514 (circuit lines 200 and 300). The current from -battery 510 and frombattery 520 owing out from the station, over line wire 200 throughstation #1, via wires 41,

42, 204, 205, 43, 44, 201, armature lever 105,

wire 245, 'lever 138, contact 140,v wires 332,

269, 268 and wires 202,203, 49-48, over line 200, etc., to the armature105 of the second station (station #2) and over such armature lto thecontact 114. At the contact 114, the

two currents divide, that from the `battery 510 flowing through the coilof relay 111,

over wires 246, 247, relay armature 108 and,

contact 109, wire 248, winding of relay 144 (S. R. H.) wire 249, wire250, across tele-y -phone contacts 165, 164 to ground ,and return, whilethe current from the battery 520 flows from post 114 over wire 245,across armature 141 and through wire 261 to the coil 119 of switch (S.R. H.) (station #2), through that coil and over wire 267, lever 131, andover wire 263 to contact 149, over armature 146 (relay 144 beingVenergized by the current from battery 510),' back into return line wireconnection 301 and over wires 45-55-308-307-83-84 line 300, to line wireconnection 52 of station #1, through the connections 52, 53, 306,146,305, 151,

155, 304, 303, 156,' 152, 302, 150, armature 146 to relay 144 (which haddenergized by breaking yits circuit at 108, 109 when relay 99 wasenergized by the last act of setting station No. 1) then through 301,45, 55, 308, 307` 83, 84, 303 back to central.

The currentA that has passed through dropping over to the positionopposite to that shown in Fig. 4, and as no further operation is neededa't the intermediate station (station #2) the switch 508 at the cent-ralstation is opened, thereby deenergizingl the holding relay 111 andpermitting the `armature 105 also to drop over and close the main linecircuit with contact 115 at station #2. The dropping over of thearmature 105 also results in the denergization of the relay 144 andcloses the main line circuit connections 301 and 302 thus leaving aclear main line circuit through station #2 to connect station #1 withthe next following station. All of the stations following station #2,excepting'the station with which it is desired to effect. telephoniecommunication (station 30) are locked out progressively in the samemanner bythe central station operator until the desired station (station30) is in free communication. Station #30 having been operatiyel'yreached,

the central station operator again closes the switch 508 and depressesthe key 514, where-l.

by the current from batteries4 510 and-520 `be rung at the same time andby unhooking the receivers' 160 the parties/at the two stations are nowin connection with each other. The telephone circuit is now limited to aconnection between the two connected premises, stations #1- and #30. Thepath open for the telephone current from stationl to station #1 is fromthe 'contact post 166 (station #30) Via wires 270, 332, armature 138,wire 215, contact 111, lever 105, line wire connection 201, and fromthence to line 200, over line wire 200 to station #1, where it comes inover line wire connections 18.-19-203-202 and passes via wire 268,

contact 126 (S. R. 11.), contact 123, wires' 269, 270 to telephonecontact stud 166 of station #1. 1t should be understood that the usuallocal battery talking circuit (not shown) would be used in practice tofurnish current for talking purposes. The operate ing party at station#1 can there depress the interrupting button 331 so as to disconnect thecentral station and prevent the central station operator fromover-hearing the conversation. l

1t should be noted that my system is not intended primarily fortelephone communication, for if that were ,the case, automatic selectinginstruments should be provided for quick connection purposes. Anystation or subscriber wishing to communicate with the central otiice toorder a connection with some other party calls the central stationoperator up but at the time he gives ,the telephone ring, he alsodepresses the key 152, holding-it depressed while communicating with thecentral office. The depression of the key 152 breaks the line wireconnection between sections 302 and 303 and connects the telephone ofthat station with line wire 300 (via wires 302 and 303), and groundreturn, for a direct connection with the central office. The depressionot the key 152 interrupts the normal constant current that is in themain line circuit and line 300 is broken at the place of interruption.,so that there is no way open for the magnetic calling .current to gothrough the central stations polarized relay and out on line 300. T heonly path for the current at the central station is now through thecentral stations telephone, the'way designated for it. When the centralstation calls any station up to speak with it, it must be done throughthe setting of the stations, nevertheless, if the central stationcompleted, or after testing the lines, the proceeding of resetting theinstruments takes place. This is accomplished by the central stationoperator pressing the ke'y 535, opening the circuit at switch 508 so asto disconnect battery 510. The current flowing, upon closing of the key535 emanates vfrom the battery 510 and iiows over line 300 to thearmature lever 11G (S.nR.-H.-) of all of' the locked out stations andboth of the stations set for telephone4 communication. From the lever116 the current flows to post 150 and from thence by a wire 262 tocontact post 125 or' switch-relay (S. over magnet bar 120 of the samethrough. core of relay 128 and over wire 270 to theA one winding ot' thecoil of relay 110 and from thence over wire 27 5 and wire 20L-etc., toline wire 200 and return to battery 510 via connection 208, 539 at thecentral station. As soon as this current is established the coil ofrelay 110 is energized and attracts the armature lever 101 (which hadbeen resting against contact posts 110 since the magnet bar 120 wasthrown into contact with the core of relay 128). The lever 101 thus is.brought out of engagement with the ,contact post 11G and the localcircuit through relay 128 is broken thereby releasing the magnet bar 120of switch relay (S. R.H.-) and permitting it to drop back into itsnormal position in to contact with the core of relay 130.

7 This breaking ot' the local circuit at contact 11G also results in thedenergization of reconsequent renergization of relays 101 andl 102 whichthereby attract the armature levers 103,101 and 105 respectively intortheir normal positions. By closing the key 535 all of the stations aresimultaneously reset.

It should be understood that when the main line circuit is cut at any'of the'stations the circuit of battery 391 (interchanging

